Each folder contains Bz maps of ARMs applied with 3000G peak fields and 2G bias fields. The 'd#' suffix denotes the orientation of the ARM out of six directions:

ARM direction: [dec, inc]
d1: [0, 36]
d2: [120, 36]
d3: [240, 36]
d4: [0, 0]
d5: [120, 0]
d6: [240, 0]

Since interference from nearby sources was more significant in 2G ARM maps than NRM maps, many maps are upward continued and/or cleaned (e.g. by subtracting out nearby sources) before fitting. 
The exact maps used for fitting each source are labeled according to the upward continuation value in microns. If a map was only used to fit a particular source, it is labeled with the source fitted.